Since commit f677fcb9aeb6 ("s390/qeth: ensure linear access to packet headers"),
the CQ-specific skbs are allocated with a slightly bigger linear part
than necessary. Shrink it down to the maximum that's needed by
qeth_extract_skb().
Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxx>
---
drivers/s390/net/qeth_core.h | 1 -
drivers/s390/net/qeth_core_main.c | 6 ++++--
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 4ab3be814ea7..7c37e94fb28b 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -221,7 +221,6 @@ struct qeth_vnicc_info {
/* large receive scatter gather copy break */
#define QETH_RX_SG_CB (PAGE_SIZE >> 1)
-#define QETH_RX_PULL_LEN 256
struct qeth_hdr_layer3 {
__u8 id;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index b32b50384c5c..3be3d13f8d65 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2627,7 +2627,8 @@ static int qeth_init_input_buffer(struct qeth_card *card,
if ((card->options.cq == QETH_CQ_ENABLED) && (!buf->rx_skb)) {
buf->rx_skb = netdev_alloc_skb(card->dev,
- QETH_RX_PULL_LEN + ETH_HLEN);
+ ETH_HLEN +
+ sizeof(struct ipv6hdr));
if (!buf->rx_skb)
return 1;
}
@@ -5264,7 +5265,8 @@ static int qeth_extract_skb(struct qeth_card *card,
if (use_rx_sg) {
/* QETH_CQ_ENABLED only: */
- if (qethbuffer->rx_skb) {
+ if (qethbuffer->rx_skb &&
+ skb_tailroom(qethbuffer->rx_skb) >= linear_len + headroom) {
skb = qethbuffer->rx_skb;
qethbuffer->rx_skb = NULL;
goto use_skb;
--
2.17.1
